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Transcript of The Skeletal System Slide 5.1 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin...
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The Skeletal System
Slide 5.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Parts of the skeletal system· Bones (skeleton)
· Joints
· Cartilages
· Ligaments (bone to bone)(tendon=bone to muscle)
· Divided into two divisions· Axial skeleton
· Appendicular skeleton – limbs and girdle
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Functions of Bones
Slide 5.2Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Support of the body
· Protection of soft organs
· Movement due to attached skeletal muscles
· Storage of minerals and fats
· Blood cell formation
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Bones of the Human Body
Slide 5.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· The skeleton has 206 bones
· Two basic types of bone tissue· Compact bone· Dense tissue
· Spongy bone· Small needle-like
pieces of bone
· Many open spaces Figure 5.2b
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Bone Classification by Shape
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Classification of Bones
Slide 5.4aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Long bones
· Typically longer than wide
· Have a shaft with heads at both ends
· Contain mostly compact bone
• Examples: Femur, humerus
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Classification of Bones
Slide 5.4bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Short bones
· Generally cube-shape
· Contain mostly spongy bone
· Examples: Carpals, tarsals
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Classification of Bones
Slide 5.5aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Flat bones
· Thin and flattened
· Usually curved
· Thin layers of compact bone around a layer of spongy bone
· Examples: Skull, ribs, sternum
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Classification of Bones
Slide 5.5bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Irregular bones
· Irregular shape
· Do not fit into other bone classification categories
· Example: Vertebrae and hip
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Classification of Bones on the Basis of Shape
Slide 5.5cCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 5.1
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Gross Anatomy of a Long Bone
Slide 5.6Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Diaphysis· Shaft
· Composed of compact bone
· Epiphysis
· Ends of the bone
· Composed mostly of spongy bone
Figure 5.2a
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Structures of a Long Bone
Slide 5.7Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Periosteum· Outside covering of
the diaphysis· Fibrous connective
tissue membrane· Sharpey’s fibers
· Secure periosteum to underlying bone
· Arteries· Supply bone cells
with nutrients Figure 5.2c
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Structures of a Long Bone
Slide 5.8aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Articular cartilage
· Covers the external surface of the epiphyses
· Made of hyaline cartilage
· Decreases friction at joint surfaces
Figure 5.2a
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Structures of a Long Bone
Slide 5.8bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Medullary cavity
· Cavity of the shaft
· Contains yellow marrow (mostly fat) in adults
· Contains red marrow (for blood cell formation) in infants
Figure 5.2a
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Bone Markings
Slide 5.9Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Surface features of bones
· Sites of attachments for muscles, tendons, and ligaments
· Passages for nerves and blood vessels
· Categories of bone markings
· Projections and processes – grow out from the bone surface
· Depressions or cavities – indentations
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Microscopic Anatomy of Bone
Slide 5.10a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Osteon (Haversian System)· A unit of bone
· Central (Haversian) canal· Opening in the center of an osteon
· Carries blood vessels and nerves
· Perforating (Volkman’s) canal· Canal perpendicular to the central canal
· Carries blood vessels and nerves
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Microscopic Anatomy of Bone
Slide 5.10b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 5.3
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Microscopic Anatomy of Bone
Slide 5.11a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Lacunae· Cavities containing
bone cells (osteocytes)
· Arranged in concentric rings
· Lamellae· Rings around the
central canal· Sites of lacunae
Figure 5.3
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Microscopic Anatomy of Bone
Slide 5.11b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Canaliculi · Tiny canals
· Radiate from the central canal to lacunae
· Form a transport system
Figure 5.3
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Changes in the Human Skeleton
Slide 5.12Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· In embryos, the skeleton is primarily hyaline cartilage
· During development, much of this cartilage is replaced by bone
· Cartilage remains in isolated areas
· Bridge of the nose
· Parts of ribs
· Joints
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Bone Growth
Slide 5.13a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Epiphyseal plates allow for growth of long bone during childhood
· New cartilage is continuously formed
· Older cartilage becomes ossified
· Cartilage is broken down
· Bone replaces cartilage
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Bone Growth
Slide 5.13b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Bones are remodeled and lengthened until growth stops
· Bones change shape somewhat
· Bones grow in width
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Long Bone Formation and Growth
Slide 5.14a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 5.4a
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Types of Bone Cells
Slide 5.15Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Osteocytes· Mature bone cells
· Osteoblasts· Bone-forming cells
· Osteoclasts· Bone-destroying cells· Break down bone matrix for remodeling and
release of calcium· Bone remodeling is a process by both
osteoblasts and osteoclasts
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Bone Fractures
Slide 5.16Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· A break in a bone
· Types of bone fractures· Closed (simple) fracture – break that does not
penetrate the skin
· Open (compound) fracture – broken bone penetrates through the skin
· Bone fractures are treated by reduction and immobilization· Realignment of the bone
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Common Types of Fractures
Slide 5.17Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Table 5.2
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Stages in the Healing of a Bone Fracture
Slide 5.19Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 5.5